So, I got two versions of a picture to choose from. One is 1280 x 919, but comes with Deviantart's added watermark. The other version, from Tumblr, is smaller (1000 x 718), but doesn't have the watermark. For comparison's sake, here is the smaller picture without watermark and this is the bigger version with the watermark.

bigger i think. the deviantart watermark (this pic actually has 2 watermarks. the artist signature in the lower right corner counts iirc.) is transparent so at worst it might need the distracting_watermark tag.

The deviantart one is definitely better quality, in addition to being bigger.